Chemistry / Unit 1 Chem 0066 short lesson, about 20 seconds
Chemical Change
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The idea
A chemical change produces one or more substances that differ chemically from the matter present before the change.
In practice
A cut apple browning is a chemical change because the brown compounds differ from the substances present in the fresh, uncut flesh.
Where people slip
Color change alone does not confirm a chemical change — food coloring in water changes color through a purely physical mixing process.
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